[Sbs_gems] [New Logentry] Run plan for straight-throughs

[puckett at jlab.org]

Logentry Text:
--
When we go to take straight through data, here is the approximate plan: 

1) Target: single C foil ("thin")
2) Trigger: ECAL-HCAL coincidence
3) SBS magnet: OFF
4) Beam current: start at 1 uA

Contact Andrew Puckett to prepare replay database for SBS tracking with zero-field. 

5) Start running beam at 1 uA. Check trigger rates and livetime. Take a short run and analyze--quick look at GEM rates/occupancies and/or tracking results. Increase beam current and/or adjust trigger threshold(s) as needed to generate a sufficient rate of events with good tracks in FT and FPP with good livetime. Important thing is to get a good mix of triggers with good tracks in SBS. Andrew will recommend a running condition. 

Take a long run (1-2 h) at the recommended beam current and threshold(s).  

The following runs are "nice to have" but optional and to be taken only if things are going very well:  
6) Switch to LH2 target
7) If any changes to trigger thresholds were made on single C foil, back them out. 
8) Start beam at 1 uA. Check trigger rates/livetime. Take a short run and analyze. Check GEM occupancy. If GEM rates/occupancies are acceptable and livetime is high, you can increase beam current to perhaps 2-3 uA. Take another ~1-2 hours of data in this configuration. 

 


---

This is a plain text email for clients that cannot display HTML.  The full logentry can be found online at https://logbooks.jlab.org/entry/4355549
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/sbs_gems/attachments/20250413/a6827109/attachment.html>